Improved syntheses of aromatase inhibitors and neuroactive steroids efficient oxidations and reductions at key positions for bioactivity

  • Campos Neves A
  • Sá E Melo M
  • Moreno M
 et al. 
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An Henbest reduction, followed by the preparation of a silyl enol ether and oxidation in situ with m-CPBA has led to the neurosteroids 3α-hydroxy- and 3α,21-dihydroxy-5α-pregnanolones. Using testosterone as starting material, a new short synthesis of an aromatase inhibitor, 4-OHA, has been achieved through hydroboration/oxidation followed by a Swern type oxidation and epimerization. Another aromatase inhibitor, androst-4-ene-3,6,17-trione, has been efficiently prepared using PCC on montmorillonite K10, under ultrasonic irradiation.

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